i haven't been successful at comparing the windows' specs, since they are hard to find in a standardized way online or across the fancy brochures i've been given. i've also been asking for the phone numbers of 3-4 references, which have been difficult to come by. of course, each salesperson claims that their product, price, and customer reviews are best and that their installers are experienced.

i'm a novice at this process. i was wondering which product (and price) you think is best based on your personal and/or professional experiences.

The Alside Excalibur is a poorly designed window with a flimsy frame. The Alside ultramaxx and Sheffield are very bulky with.poorly designed sills. They use pocket sills and snap I. Sloped sills which are inherently poor designs.
Soft lite imperial LS IS A TRUELY WELDED SLOPED SILL, a much better design. The LS is much better for a variety of other reason. That is a very low price for the LS so I it's an easy decision.